Hi Newfangle,
Multi-regioning for a TV means setting the TV to specific PAL, SECAM or NTSC systems, often several, but most TVs nowadays autoswitch between systems.
i think you mean multi-zoning for DVD. For example, UK uses PAL zone 2, while US uses NTSC zone 1, Australia PAL zone 4 etc. Multizoning will probably void the warranty if it's not done by your B&O service centre, but then will they do it?
We were lucky here in Australia until a few months ago. most of our B&O DVD players were multi-zone (and multi system). Now the company here has changed its policy to excluding play for discs zoned outside the region.
Look forward to BluRay ... it's zone free, but DRM'd to the hilt.